use default logic DOL for distributed ontologies
fix logic nil test
Merge branch 'staging' into 746-default_distributed_logic

Conflicts:
	spec/models/ontology_spec.rb
fix logic test description
fix syntax error: add end keyword
remove dead code: DOL logic is only applied in one place
Merge pull request #804 from ontohub/746-default_distributed_logic

746 default distributed logic
use hets-xml fixture to not trigger remote network

In order to not use a remote network connection to
find the referenced ontology, we (sadly) need to
use a hets-xml output fixture.
Merge branch 'staging' into 765-references_in_distributed_ontologies